本文介绍了如何将NSManagedObject转换为NSDictionary的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我试图将 NSManagedObject
转换为 NSDictionary
这是我尝试:
I am trying to convert NSManagedObject
to NSDictionary
this is what I tried:
var keys:NSArray = order?.entity.attributesByName.keys
var dict:NSDictionary = order?.dictionaryWithValuesForKeys(keys)
但我收到错误:
LazyForwardCollection<MapCollectionView<Dictionary<NSObject,
AnyObject>, NSObject>>? is not convertible to NSArray.
我在这里做错了什么?
推荐答案
字典的键
属性返回 LazyForwardCollection
转换为实数数组。
The keys
property of a dictionary returns a LazyForwardCollection
which has to be converted to a real array.
另一个问题是, order
显然是一个可选项,因此需要
才能解开。可选绑定。
Another problem is that order
is apparently an optional, so it needsto be unwrapped, e.g. with optional binding.
if let theOrder = order {
let keys = Array(theOrder.entity.attributesByName.keys)
let dict = theOrder.dictionaryWithValuesForKeys(keys)
} else {
// order is nil
}
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